The ABCs of Sexuality is a helpful glossary of frequently-used terms in discussions around sexual identity and gender expression
RFA LGBTQIA+ Terminology Guide (v. 2) Adapted in January 2022, then updated in December 2022, this Guide defines terms within the lens of parts of everyone’s identity, including sexes, gender identities and expressions, and orientations. This guide is presented with the acknowledgment that terms are fluid, not all terms are acceptable or preferable to those whom they seek to describe, and the immense breadth of LGBTQIA+ terminology cannot be fully addressed here.
PFLAG offers a comprehensive, interactive LGBTQ+ glossary.